Method of producing zinc vitriol using indium extraction raffinate and zinc oxide

A technology of zinc sulfate heptahydrate and indium raffinate, which is applied in the direction of zinc sulfate, can solve side effects and other problems, and achieve the effects of accelerating filtration speed, saving raw materials, and saving time

Inactive Publication Date: 2006-03-29
株洲冶炼集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the production of zinc sulfate heptahydrate requires zinc oxide and sulfuric acid as raw materials. If the zinc and sulfuric acid in the indium raffinate can be applied to the production of zinc sulfate heptahydrate, the comprehensive utilization of the indium raffinate can be realized. But how to avoid organics in indium raffinate, P 204 (30~70g / l), arsenic (1~3g / l), iron, manganese, copper and other impurities produce side effects, which are technical problems that must be solved

Method used

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  • Method of producing zinc vitriol using indium extraction raffinate and zinc oxide

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Experimental program
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Effect test

Embodiment 1

[0024] Produce zinc sulfate heptahydrate with the present invention, contain zinc 43.93g / l, sulfuric acid 52.22g / l, organic matter P in the indium raffinate 204 0.07g / l, arsenic 2.43g / l, iron 1.64g / l, manganese 1.75g / l, copper 0.51g / l, cadmium 0.72g / l, etc. The production steps are as follows:

[0025] 1. Preparation of leaching solution: Calculate the amount of indium raffinate to be added, the amount of industrial sulfuric acid with a concentration of 93% and the amount of zinc oxide in the lead fuming furnace according to the amount of zinc and sulfuric acid contained in the indium raffinate, and use the calculation results to Indium raffinate and sulfuric acid are prepared leach solution, obtain zinc: the leach solution of the molar ratio of sulfuric acid=1:1.2;

[0026] 2. Zinc oxide leaching step: raise the temperature of the leaching solution. After the temperature of the solution rises to 70°C, continue to heat up and slowly add zinc oxide to the lead fuming furnace f...

Embodiment 2

[0033] Produce zinc sulfate heptahydrate by the method of embodiment 1 with the present invention, difference is:

[0034] Indium raffinate contains zinc 30.93g / l, sulfuric acid 80.00g / l, organic matter P 204 0.07g / l, arsenic 2.53g / l, iron 1.84g / l, manganese 1.54g / l, copper 0.76g / l, cadmium 0.88g / l, etc.

[0035] In the leach solution preparation step, zinc: the mol ratio of sulfuric acid=1: 1.5, sulfuric acid concentration is 98%; Potassium permanganate is industrial pure in the purifying step, directly uses with solid granular state; When the filtrate is concentrated to specific gravity in the concentrating step, be 1.60g / cm 3 Put it into the crystallization tank; in the crystallization step, centrifuge when the solution temperature is cooled to 40°C.

Embodiment 3

[0037]Produce zinc sulfate heptahydrate with the present invention by the method for embodiment 1, difference is: contain zinc 60.93g / l, sulfuric acid 50.22g / l, organic matter P in the indium raffinate 204 0.05g / l, arsenic 2.43g / l, iron 1.88g / l, manganese 2.09g / l, copper 0.65g / l, cadmium 0.53g / l, etc.

[0038] In the leach solution preparation step, zinc: the mol ratio of sulfuric acid=1: 1, and sulfuric acid concentration is 95%; Potassium permanganate is industrial pure in the purifying step, directly uses with solid granular state; When filtrate is concentrated to specific gravity in the concentration step, be 1.60g / cm 3 Put it into the crystallization tank; in the crystallization step, centrifuge when the solution temperature is cooled to 35°C.

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Abstract

A process for preparing heptahydrated zinc sulfate from the residual liquid after extracting indium and zinc oxide includes such steps as preparing the extracting liquid from said residual liquid and sulfuric acid, heating, extracting zinc oxide while stirring, laying aside, filtering, oxidizing the filtrate by potassium permangnate for removing Fe and Mn, cleaning by using zn powder for displacement, concentrating, crystallizing, separating and drying.

Description

technical field [0001] The invention relates to a production method of zinc sulfate heptahydrate, in particular to a method for producing zinc sulfate heptahydrate by using indium raffinate and zinc oxide produced in the lead-zinc smelting process. Background technique [0002] In the lead-zinc smelting process, indium, gold, silver and other valuable metals need to be recovered comprehensively at the same time. Usually, the indium recovery smelting method adopts the traditional indium-enriched slag leaching-extraction-electrolysis process. The indium raffinate produced in the recovery of indium smelting process contains part of zinc (30-60g / l), sulfuric acid (40-80g / l), organic matter P 204 (30~70g / l), arsenic (1~3g / l), iron, manganese, copper and other substances. In order to recover the zinc and sulfuric acid in it, in the past, the indium raffinate was returned to the lead and zinc smelting system for use in ore blending. Reached 80~100m 3 If all of the above are retu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06
Inventor 陈雪云李维鉴张辉华陈顺
Owner 株洲冶炼集团有限责任公司
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